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| author | Thomas Munro <tmunro@postgresql.org> | 2019-06-18 22:38:30 +1200 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2019-06-19 02:13:52 +1200 |
| commit | 14d8b539d3bd4cf9faf65ca86a733bada202107f (patch) | |
| tree | 5e6d8f501f6c0bcb5db8117657ee9bc3731578d1 /src/backend/access/gist/gistget.c | |
| parent | e5f26d79badfae8018ac70f2137158fe36246c2b (diff) | |
| download | postgresql-14d8b539d3bd4cf9faf65ca86a733bada202107f.tar.gz postgresql-14d8b539d3bd4cf9faf65ca86a733bada202107f.zip | |
Prevent Parallel Hash Join for JOIN_UNIQUE_INNER.
WHERE EXISTS (...) queries cannot be executed by Parallel Hash Join
with jointype JOIN_UNIQUE_INNER, because there is no way to make a
partial plan totally unique. The consequence of allowing such plans
was duplicate results from some EXISTS queries.
Back-patch to 11. Bug #15857.
Author: Thomas Munro
Reviewed-by: Tom Lane
Reported-by: Vladimir Kriukov
Discussion: https://postgr.es/m/15857-d1ba2a64bce0795e%40postgresql.org
Diffstat (limited to 'src/backend/access/gist/gistget.c')
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